The primary reflector of the collector mirror field of a linear Fresnel solar thermal system

Abstract

The present invention discloses a primary reflecting mirror of a linear Fresnel solar thermal system collector mirror field, belonging to the technical field of solar thermal power generation. It includes a chassis, both ends of the top of the chassis are fixedly connected with mounting beams, a bearing is fixedly connected inside the mounting beam, a driving shaft is fixedly connected inside the bearing, a reflecting mirror is sleeved outside the driving shaft, a brake friction plate is sleeved at one end of the driving shaft, an electromagnetic clutch is arranged on one side of the brake friction plate, and a driving friction plate is fixedly connected at one end of the electromagnetic clutch. A driving box is fixedly connected at one end of one of the mounting beams. The angle of the reflecting mirror is fixed to reflect sunlight to the Fresnel lens for solar thermal power generation. The reduction in the width of the reflecting mirror increases the concentration ratio of the reflecting mirror, while the reduction in the width of the Fresnel lens decreases the concentration ratio, improving the utilization efficiency of sunlight; by adjusting the deflection angle of each reflecting mirror, the focal position and focal length of the reflected light can be precisely controlled by the entire row of mirror surfaces, improving the utilization efficiency of sunlight.

Description

Technical Field

[0001] The present invention belongs to the technical field of photothermal power generation, and in particular relates to a primary reflector in a heat collecting mirror field of a linear Fresnel photothermal system. Background Art

[0002] There are many factors that need to be optimized in designing a solar thermal power plant. Apart from some systems (or factors) within the scope of conventional thermal systems, the main factors include the optimization of mirror field layout, mirror field size (lighting area), heat storage capacity, and molten salt pump configuration. If other conditions remain unchanged, increasing the heat storage capacity within a certain range can increase the annual power generation of the power plant or enhance the adaptability of the power station to grid dispatch, but at the same time increase the project investment. If other conditions remain unchanged, increasing the light-collecting area of ​​the mirror field can also increase the annual power generation of the power station. Under a certain heat storage capacity (other conditions remain unchanged), the light-collecting area of ​​the mirror field has a value that minimizes the corresponding cost per kilowatt-hour or maximizes the annual average photovoltaic conversion efficiency of the project. Under a certain mirror field area (other conditions remain unchanged), the heat storage capacity has a value that also minimizes the corresponding cost per kilowatt-hour or maximizes the annual average photovoltaic conversion efficiency of the project. Summary of the invention

[0003] The technical problem to be solved by the present invention is that, in view of the problem that the utilization rate of sunlight by reflectors in the existing photothermal technology is not high, a primary reflector for a heat collecting mirror field of a linear Fresnel photothermal system is proposed.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A primary reflector for a thermal collector field of a linear Fresnel solar thermal system comprises a base frame, both ends of the top of the base frame are fixedly connected with mounting beams, a bearing is fixedly connected inside the mounting beams, a driving shaft is fixedly connected inside the bearings, a reflector is sleeved on the outer side of the driving shaft, a brake friction plate is sleeved on one end of the driving shaft, an electromagnetic clutch is provided on one side of the brake friction plate, one end of the electromagnetic clutch is fixedly connected to the driving friction plate, one end of one of the mounting beams is fixedly connected to a driving box, and the driving box is drivingly connected to the driving shaft through the driving friction plate.

[0006] A motor is arranged at the inner bottom of the driving box, a turbine seat is fixedly connected to the inner top of the driving box, the turbine seat is fixedly connected to the turbine via a connecting shaft, a worm is meshed on one side of the turbine, and both ends of the worm are rotatably connected to the side wall of the driving box.

[0007] The worm and the motor are both provided with pulleys, and a belt is provided inside the pulley. The belt is used for transmission connection between the worm and the motor.

[0008] The belt pulley is located in the middle of the worm.

[0009] The mirror sequentially includes a toughened glass layer, a highly polished reflective film, a mirror base plate, a thermal insulation layer, and a protective shell from top to bottom.

[0010] The drive shaft is in a fishbone shape and is fixedly connected between the mirror base plate and the thermal insulation layer.

[0011] A connecting frame is arranged in the middle of the base plate. A bearing is clamped inside the connecting frame. The fixing cap is fixedly connected to the connecting frame through bolts. Installation holes are provided on the base plate.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] Start the motor. The pulley at the output end of the motor, the belt, and the pulley in the middle of the worm drive the turbine meshing with the worm to rotate. When the electromagnetic clutch is closed, the driving friction plate frictions with the drive shaft to drive the mirror to adjust the angle. When adjusted to a certain angle, the electromagnetic clutch is released, and the brake friction plates made of magnets attract and friction with each other. Limited by the resistance, the angle of the mirror is fixed, and the sunlight is reflected to the Fresnel lens for solar thermal power generation. The reduction in the width of the mirror increases the concentration ratio of the mirror. At the same time, the reduction in the width of the Fresnel lens reduces the concentration ratio, improving the utilization efficiency of sunlight; adjust the deflection angle of each mirror, so that the entire row of mirrors can accurately control the focal position and focal length of the reflected light, improving the utilization efficiency of sunlight.

[0014] A 1m * 2m mirror is divided into 8 mirrors of 25cm * 1m. Through the settings of the toughened glass layer, the highly polished reflective film, the mirror base plate, the thermal insulation layer, and the protective shell, the rigidity and hardness of the mirror are enhanced, facilitating the installation of the drive shaft. At the same time, the thermal insulation layer can also insulate the mirror, better reflecting the energy of sunlight and also facilitating the installation of the mirror. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present invention.

[0016] Figure 2 is a three-dimensional structural diagram of an embodiment of the present invention.

[0017] Figure 3 is a schematic structural diagram of the base plate of an embodiment of the present invention.

[0018] Figure 4 is an enlarged schematic diagram of the mirror of an embodiment of the present invention.

[0019] Reference numerals and names of the drawings: chassis 1, mounting beam 2, bearing 3, drive shaft 4, mirror 5, toughened glass layer 501, highly polished reflective film 502, mirror base plate 503, thermal insulation layer 504, protective housing 505, brake friction pad 6, electromagnetic clutch 7, drive friction pad 8, drive box 9, turbine seat 10, turbine 11, worm 12, motor 13, pulley 14, belt 15, connecting frame 16, fixing cap 17, mounting hole 18. Detailed implementation mode

[0020] The present invention will be described in detail below with reference to the drawings and specific embodiments. Here, the schematic embodiments of the present invention and the description are used to explain the present invention, but do not limit the present invention.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0022] Embodiment 1

[0023] As Figures 1-4As shown in the figure, a primary reflector of a linear Fresnel solar thermal system according to the present invention includes a chassis 1. Both ends of the top of the chassis 1 are fixedly connected with mounting beams 2. A bearing 3 is fixedly connected inside the mounting beam 2. A driving shaft 4 is fixedly connected inside the bearing 3. A reflecting mirror 5 is sleeved outside the driving shaft 4. One end of the driving shaft 4 is sleeved with a brake friction plate 6. An electromagnetic clutch 7 is arranged on one side of the brake friction plate 6. One end of the electromagnetic clutch 7 is fixedly connected with a driving friction plate 8. One end of one of the mounting beams 2 is fixedly connected with a driving box 9. The driving box 9 is in transmission connection with the driving shaft 4 through the driving friction plate 8. A motor 13 is arranged at the inner bottom of the driving box 9. A turbine seat 10 is fixedly connected to the inner top of the driving box 9. The turbine seat 10 is fixedly connected with a turbine 11 through a connecting shaft. A worm 12 is meshed with one side of the turbine 11. Both ends of the worm 12 are rotatably connected to the side wall of the driving box 9. It is characterized in that: pulley 14 is arranged on both the worm 12 and the motor 13. A belt 15 is arranged inside the pulley 14. The belt 15 is used for the transmission connection between the worm 12 and the motor 13. The pulley 14 is located in the middle of the worm 12. The reflecting mirror 5 sequentially includes a toughened glass layer 501, a highly polished reflective film 502, a mirror bottom plate 503, a heat preservation layer 504 and a protective shell 505 from top to bottom. The driving shaft 4 is in a fishbone shape. The driving shaft 4 is fixedly connected between the mirror bottom plate 503 and the heat preservation layer 504. A connecting frame 16 is arranged in the middle of the chassis 1. The bearing 3 is clamped inside the connecting frame 16. A fixing cap 17 is fixedly connected to the connecting frame 16 through bolts. Mounting holes 18 are formed on the chassis 1. Start the motor 13. The pulley 14 at the output end of the motor 13, the belt 15 and the pulley 14 in the middle of the worm 12 are used to rotate the turbine 11 meshed with the worm 12. When the electromagnetic clutch 7 is closed, the driving friction plate 8 frictions with the driving shaft 4 to drive the reflecting mirror 5 to adjust the angle. When adjusted to a certain angle, the electromagnetic clutch 7 is loosened. The brake friction plates 6 made of magnets attract and friction with each other. Restricted by the resistance, the angle of the reflecting mirror 5 is fixed. The sunlight is reflected to the Fresnel lens for solar thermal power generation. The width of the reflecting mirror 5 is reduced, increasing the concentration ratio of the reflecting mirror 5. At the same time, the width of the Fresnel lens is reduced and the concentration ratio is reduced, improving the utilization efficiency of sunlight; adjust the deflection angle of each reflecting mirror 5, so that the entire row of mirrors can accurately control the focal position and focal length of the reflected light, improving the utilization efficiency of sunlight.

[0024] Embodiment 2

[0025] On the basis of Embodiment 1, the difference between Embodiment 2 and Embodiment 1 lies in that: mounting beams 2 are fixedly connected to both ends of the top of the chassis 1, a connecting frame 16 is arranged in the middle of the chassis 1, a bearing 3 is clamped inside the connecting frame 16, a fixing cap 17 is fixedly connected to the connecting frame 16 through bolts, mounting holes 18 are formed in the chassis 1, the 1m*2m mirror 5 is divided into 8 mirrors 5 of 25cm*1m, through the settings of the tempered glass layer 501, the highly polished reflective film 502, the mirror bottom plate 503, the heat preservation layer 504 and the protective shell 505, the rigidity and hardness of the mirror 5 are enhanced, facilitating the installation of the drive shaft 4. At the same time, the heat preservation layer 504 can also insulate the mirror 5, better reflecting the energy of sunlight. Through the settings of the mounting beam 2, the connecting frame 16 and the fixing cap 17, the installation of the mirror 5 is facilitated, and the formation of the mounting holes 18 facilitates the installation and fixation of the entire bracket.

[0026] The technical solutions provided by the embodiments of the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to helping understand the principles of the embodiments of the present invention.

Claims

1. A primary reflector of a linear Fresnel solar thermal system's collector mirror field, comprising a chassis (1), characterized in that: Both ends of the top of the base frame (1) are fixedly connected to a mounting beam (2), the interior of the mounting beam (2) is fixedly connected to a bearing (3), the interior of the bearing (3) is fixedly connected to a drive shaft (4), the outer side of the drive shaft (4) is sleeved with a reflector (5), one end of the drive shaft (4) is sleeved with a brake friction plate (6), one side of the brake friction plate (6) is provided with an electromagnetic clutch (7), one end of the electromagnetic clutch (7) is fixedly connected to a drive friction plate (8), one end of one of the mounting beams (2) is fixedly connected to a drive box (9), the drive box (9) is transmission-connected to the drive shaft (4) through the drive friction plate (8); the drive shaft (4) is in a herringbone shape, and the drive shaft (4) is fixedly connected between the mirror bottom plate (503) and the thermal insulation layer (504); The reflector (5) comprises, from top to bottom, a tempered glass layer (501), a high-polished reflective film (502), a mirror bottom plate (503), a heat-insulating layer (504) and a protective shell (505); The inner bottom of the drive box (9) is provided with a motor (13), the inner top of the drive box (9) is fixedly connected with a turbine seat (10), the turbine seat (10) is fixedly connected with a turbine (11) via a connecting shaft, a worm (12) is meshed on one side of the turbine (11), and both ends of the worm (12) are rotatably connected to the side wall of the drive box (9); The worm (12) and the motor (13) are both provided with a pulley (14), a belt (15) is provided inside the pulley (14), and the belt (15) is used for transmission connection between the worm (12) and the motor (13); the pulley (14) is located in the middle of the worm (12); A connecting frame (16) is arranged in the middle of the base frame (1), a bearing (3) is clamped inside the connecting frame (16), a fixing cap (17) is fixedly connected to the connecting frame (16) by means of bolts, and a mounting hole (18) is provided on the base frame (1).

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